Phase I: energy-conservation potential of Portland cement particle-size-distribution control. Final report, March 1979

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The properties of cements with carefully controlled particle-size distributions were compared with those of normally ground cements having a Blaine fineness of about 3600 cm/sup 2//g. Progressive reduction of the maximum particle size to 20 microns improved strength development. Further reduction to about 14 microns decreased rather than improved strength development. Some of these particle-size-controlled cements produce as-high, and often much-higher, strengths at ages from 1 to 60 days at Blaine finenesses 450 to 800 cm/sup 2//g lower than the normal grinds of the same composition. The cements with 20-micron maximum-size particles can have finenesses as low as 2800 cm/sup ... continued below

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Pages: 107

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Creator: Unknown. March 1, 1979.

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Description

The properties of cements with carefully controlled particle-size distributions were compared with those of normally ground cements having a Blaine fineness of about 3600 cm/sup 2//g. Progressive reduction of the maximum particle size to 20 microns improved strength development. Further reduction to about 14 microns decreased rather than improved strength development. Some of these particle-size-controlled cements produce as-high, and often much-higher, strengths at ages from 1 to 60 days at Blaine finenesses 450 to 800 cm/sup 2//g lower than the normal grinds of the same composition. The cements with 20-micron maximum-size particles can have finenesses as low as 2800 cm/sup 2//g, whereas with larger particles, higher specific-surface areas are required for equal strengths. The improved strengths were a result of more-rapid and more-complete hydration of the cement. Variations of clinker composition did not significantly alter these conclusions. Drying shrinkage of the particle-size-controlled cements was in some cases less than for normally ground cements. They also performed better than normally ground cements over a wide range of mixing and curing temperature (42/sup 0/F to 100/sup 0/F). Direct energy conservation of 27% in finish grinding and 8.5% in more-efficient utilization of the cement is estimated to result from the use of particle-size-controlled cements. For a US production of 75 million tons, this corresponds to conservation of 46.5 trillion Btu/year.

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Pages: 107

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Dep. NTIS, PC A06/MF A01.

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  • Report No.: COO-4269-T1
  • Grant Number: EC-77-C-02-4269
  • DOI: 10.2172/5669750 | External Link
  • Office of Scientific & Technical Information Report Number: 5669750
  • Archival Resource Key: ark:/67531/metadc1093039

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1979

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  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 20, 2018, 1:14 p.m.

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Phase I: energy-conservation potential of Portland cement particle-size-distribution control. Final report, March 1979, report, March 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1093039/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.